JPH079861A - Engine support structure for work vehicle - Google Patents

Abstract

PURPOSE:To properly maintain the driving state of a belt transfer device under a high load, and improve the transmission efficiency or the durability of the device by mounting and supporting the engine of a vehicle such as a riding type rice-planting machine in specific three-dimensional oblique posture. CONSTITUTION:A riding type rice-planting machine has an engine 2 laid at the front section of a travel base body, and the rotation of an engine output shaft 2a is transmitted to a transmission case 4 via a belt drive device 3. In this case, the engine 2 is laid obliquely with the rear section thereof positioned higher than the front section by a preset amount, and with the lateral side of the output shaft 2a at the installation side positioned higher than the opposite lateral side by a present amount respectively. Also, the front side of the engine 2 is supported on a frame 7 via a bush type rubber cushion 8, and the rear side thereof is supported thereon via a rubber cushion 9. As a result, even when the engine 2 is slanted down, upon the appearance of a high drive load and a subsequent increase in belt tension, proper drive state can be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush type front end side of an engine, in which a sideways output shaft of an engine and a sideways input shaft of a mission case disposed obliquely rearward and downward thereof are interlockingly connected by a belt transmission. TECHNICAL FIELD The present invention relates to an engine support structure for a work vehicle, which is pivotally connected to a frame via a vibration isolating rubber so as to be vertically rotatable around a horizontal axis and supports the rear end side of the engine via a vibration isolating rubber in the vertical direction. .

[0002]

2. Description of the Related Art In the engine support structure for a work vehicle described above, conventionally, the output shaft of the engine and the input shaft of the mission case are in an initial assembled state, that is, a no-load state in which a transmission belt of a belt transmission is wound. In this state, the engine and the mission case are installed so that their respective axes are substantially parallel to each other.

[0003]

As described above, the engine having the structure in which the front end side of the engine is pivotally connected to the body frame through the bush type vibration damping rubber so as to be vertically rotatable about the horizontal axis is The vibration of the engine can be suppressed from being transmitted to the machine frame, and noise can be reduced due to machine vibration and deterioration of the driving environment due to vibration of the driver's seat can be suppressed, while, for example, the front end side and the rear end side of the engine can be Compared with the case where each of them is supported via vertical vibration proof rubber, the longitudinal vibration due to the engine being pulled toward the mission case due to the change in belt tension due to the change in load on the working machine side is suppressed. Although it has possible advantages, there are still the following points to be improved. In other words, the output shaft of the engine and the input shaft of the transmission case are both cantilevered and project laterally to one side, and when the load on the belt transmission becomes large, the engine tension will be increased due to the belt tension. Since a cantilevered rearward pulling force acts on the engine and the engine is rubber-mounted as described above, the engine output shaft is inclined rearward and obliquely downward toward the outward protruding end side due to the belt tension, and the power is transmitted. When the output shaft pulley is inclined with respect to the belt, local sliding contact wear occurs between the transmission belt and the pulley, resulting in early damage such as cutting damage and reduction in transmission efficiency. The present invention aims to eliminate the above-mentioned problems.

[0004]

In the engine support structure for a work vehicle described at the beginning, the characteristic configuration of the present invention is that the rear side is set more than the front side by a set amount when the belt transmission is in an unloaded state. The engine in an oblique position in which the lateral output shaft is disposed above the horizontal side by a set amount relative to the opposite lateral side. It is attached and supported to the frame.

[0005]

As described above, since the engine is mounted and supported in a three-dimensional oblique posture, when the driving load becomes large and the belt tension becomes large, the output of the rubber-mounted engine is caused by the tension. When the shaft portion is tilted rearward and obliquely downward by a tensile force, the engine output shaft and the transmission case input shaft have their axes substantially parallel to each other when the driving load is large. as a result,
In a working state in which a large load is applied, the transmission belt and the engine output side pulley in the belt transmission are set to an appropriate sliding contact transmission state, and a good transmission state is revealed.

[0006]

Accordingly, by mounting the engine on the frame with rubber, it is possible to effectively prevent the vibration of the engine from being transmitted to the machine body, but it is possible to obtain a proper transmission state of the belt transmission under a high load condition. Will be
It has become possible to improve the transmission efficiency and durability of the belt transmission.

[0007]

Embodiments of the present invention will be described below with reference to an engine supporting structure of a riding type rice transplanter which is an example of a working vehicle. FIG. 1 shows a front part of a traveling machine body of a riding type rice transplanter, an engine 2 covered with a hood 1 is provided on the front part of the machine body, and an output pulley 2b mounted on a sideways output shaft 2a of the engine 2 is provided. Is transmitted to the input pulley 4b mounted on the input shaft 4a of the transmission case 4 via the belt transmission device 3. The engine 2 has an engine mounting base 5 connected to the lower surface thereof,
It is vibration-proofed and supported by an engine mounting frame 7 connected to the front part of the.

In the vibration-proof support structure of the engine 2, the front end side of the engine mounting base 5 is rotated up and down around the horizontal axis on the engine mounting frame 7 via the bush type vibration-proof rubber 8 with the axis oriented horizontally. It is movably pivotally supported, and the rear end side is supported via a vibration isolating rubber 9 arranged in an inwardly inclined posture so as to face the center of the engine.

As shown in FIG. 2, the anti-vibration structure on the front end side of the engine mounting base 5 is connected to a pair of left and right cylindrical brackets 5a connected to the lower surface of the engine mounting base 5 and the engine mounting frame 7. A rod-shaped pivot pin 10 is inserted across a pair of left and right brackets 7a, and a rubber bush 8 as a bush type vibration-proof rubber is fitted between the tubular bracket 5a and the pivot pin 10. I am doing it. Then, a lateral gap between the tubular bracket 5a on the engine mounting base 5 side and the bracket 7a on the engine mounting frame 7 side is set to about 0.2 to 0.3 mm so as to suppress the rattling in the lateral direction. There is.

As shown in FIGS. 1 and 2, the vibration isolation structure on the rear end side of the engine mounting base 5 has upper and lower bolts 9 as shown in FIG.
The bolt 9a on the upper side of the vibration-proof rubber 9 formed by baking and fixing the rubber 9b between the a and 9a is attached to the engine mounting base 5.
The lower bolt 9a is inserted into and fixedly connected to the bolt through hole formed in the bracket through hole formed in the bracket 7b on the engine mounting frame 7 side.

Then, in a state where the belt transmission 3 is in an unloaded state, the rear side is in an oblique posture in which the rear side is positioned above the front side by a set amount, and the sideways output shaft 2 is provided.
The engine 2 is mounted and supported on the engine mounting frame 7 in a state where the lateral side portion on the side where a is disposed is in an inclined posture in which the lateral side portion is located a predetermined amount above the opposite lateral side portion. More specifically, the thickness of the anti-vibration rubber 9 on the rear end side of the engine mounting base 5 is set to be slightly thicker so that the rear side of the engine 2 is in an oblique posture that is positioned above the front side by a set angle. Configured. Also, as shown in FIG.
On the lateral side on which the lateral output shaft 2a is disposed, the mounting portion 2c of the engine 2 and the engine mounting base 5 are configured to be bolted together with a spacer member 11 interposed therebetween. The output shaft 2a, that is, the output pulley 2b, is configured to be in an oblique posture in which the output shaft 2a is positioned slightly higher toward the outer side. The spacer member 11 has a thin plate structure, and an appropriate number of the spacer members 11 are stacked in accordance with load characteristics.

[Other Embodiments] Instead of the structure in which the spacer member 11 is interposed between the engine 2 and the engine mounting base 5 as described above, the engine mounting base 5 is arranged so that the engine 2 has a set oblique posture. Alternatively, the engine mounting frame 7 may be formed in a predetermined shape in advance.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Side view of the front of rice transplanter

FIG. 2 is a plan view of an engine mounting portion.

FIG. 3 is a front view of an engine mounting portion.

[Explanation of symbols]

 2 engine 2a output shaft 3 belt transmission device 4 mission case 4a input shaft 7 frame 8 and 9 anti-vibration rubber

Claims (1)

[Claims] 1. A lateral output shaft (2a) of an engine (2).
And a sideways input shaft (4a) of a mission case (4) arranged obliquely rearward and downward thereof are interlockingly connected by a belt transmission (3), and a front end side of the engine (2) is a bush type vibration-proof rubber ( 8) is pivotally connected to the frame (7) so as to be rotatable up and down around the horizontal axis, and the rear end side of the engine (2) is supported via a vibration isolating rubber (9) in the vertical direction. An engine support structure for a work vehicle, wherein, in a state in which the belt transmission (3) is in an unloaded state, the rear side is in a slanted position with a set amount above the front side, and the sideways direction is set. The engine (2) with respect to the frame (7) in a state in which the lateral side portion on which the output shaft (2a) is disposed is in an oblique posture in which the lateral side portion is positioned above the opposite lateral side portion by a set amount. An engine support structure for work vehicles that are mounted and supported.